Rotation mechanism for rock drills



Sept. 23, 1930. 5. w. HULSHIZER ROTATION MECHANISM FOR ROCK DRILLSINVENTOR. tj'eor Jig/5'11 120i Filed Jan. 12. 1928 1715 A TORNEY;

Patent-ed Sept. 23, 1930 v P ENT-O I em ts-aw. nunsnrznn; orsrnwAR'rswLLE'; Jnnsnmnssrenon TO INGEBSOLL- nnivncomrnmr; orJnnsEY 01m,NEW JERSEY, A CORPORATION or New: JERSEY;

' l-"nlornrIolirmncrrnmsm r011 Roox DRILrs ."glpplicatienfiled ianuarylfl, 1928. Serial 246,231.

1 y f This [invention relates [to l Q but more particularly to rotationmechanism r or fluid actuated rock drills of the hammertype. "Theobjects oftheinvention-are to impart l rotary Imovement to the drillsteel between successive blows of the hammer piston and to e eflect apromptand positive engagement and instant release-between the'rotary andfixed 5 elements ofthe rotation mechanism.

to' all of these ends thefinvention consists of the combination ofelements and arrangement or" parts'having the general modeflof operationsubstantially as hereinafter described and Figurel isasectionaljelevation ofa rock drill having the inventionapplied'thereto,

-- Figure 2 is a transverse View taken through tioncup.

2,Figure 1011 the line 22 lookingin the directionindicatedhy the arrows,I a 1 Figure 3 is a view similarto Figurel2, taken 7 on line 33 ofFigured, 1

F Fi ure l-is a'perspective view of the rotation cover, and a 5Figure5is a perspective view of the rota Referring to dr gs; the invention is""shown'emb odied in a rock drill having a pylinderA' provided-with ahammer piston B reciprocable in the cylinder for delivering blows ofimpact to a working implement (not shown) extending into the front'endof the rockdrill. ij, 1 a s v v 'On the rearward'end of the cylinder Ais disposed aback cylinder C having a hollow extension 1) whichprojectsinto thecylinder VA to guide the hammer piston B. The rear-.;erative position inany suitable manner, as v for'instance, by the sidebolts G disposed on i Pressure fluid for actuating the drill may. beconveyed from a suitable source of supply -5 (notshown) by a connectionH attached to 'oppo'sitesides of the drill. i

5. Other objects will appear hereinafter, and v claimed and illustratedin the; accompanying drawings,-inwhich.

the back head A passage J a formed in the back head F, the rotation ringE'andthe back :cylinder conveys the pressure fluid from the connection Hto a throttle valve K in the back cylinder OQ The throttle valve Kmaybeof a ,well known type and is adapted to control the admission ofpressure fluid into theback cylinder 0 where it may be distributed bythe,piston B in a well known manner.

) Suitablemeans are provided for imparting a stephy step rotativemovement to the workmg implement preparatory to the deliverylof the blowof the hammer piston thereto. To that end a fluted rifle bar L which isjournalled in the back head F at one'end and also ,inthe back cylinder Cextends throughjthe' said back cylinder and"interlocks slidably with afluted rifle nut O in the rearward end of the piston'B. Near therearward end of ,the riflexbar L isa cam P in the form of aparallelogram having two long straight sides Q, and end surfaces Rinclined'withrespect to the sidesf Q, but parallelwith respect to eachother. 1 l y a The cam Plies within the'rotation ring E and is encircledby a cup Sfwhich seats with its front end on the back cylinder, 0 andwith its rearwardend on the back head F. :The cup S is adaptedto'rotatein the rotation ring andhas .a central aperture T in its frontend to rotatably receive, therifle harL. I

, A closure is provided forJt-he rearward end of the cup S in the formof a' cover U which has a cylindricalbody portionqV adapted to fitsnugly in the rearwardend ofthe cup S. In order topreVnt rotation ofthecoverU with respect'to'the'cup '5, said cover is provided with pair ofdiametrically opposed wings W which in the assembled position seat intonotches Xin the rearward end of the cup S, In the peripheries of the cupSand the cover U are formed longitudinal slots Y and Z respectivelywhichin the assembled position of these elements will be in alignmentwith each other to serve asguides for rollers b adapted to be pressedbetween the end surfaces. R ofthe cam and the wall of the cup S. [Thecover Ualso hasa central aperture 0 to receive the rearward end of therifle bar'L for which. itif rrns a bearing V cam P, thus at all timesassuring the correct The heyam 'z w erem;

are disposed are preferably'onlyof slightly 35 ring;

relative positions of the cam and the rollers,

the cover U is'provided with integral" lugs d on one side thereof to"extendinto the :cup S tofa point near the bottom of "said cup.

The outer surfaces 6 of the lugs d are suitably-- cu rtveclito cervre polt win rur f I p I a h p 3 the rifle barL will 'b'e sulfioiently'rot'atdib'y he 6119 aga nst: Wh Qh they-$6555? Parent ing relativetransverse movement between the cover U andsaid cup, andalsofto preventdivergence'isonly of suchextent as to p rmit of I only" sufii'cientrotation of the cam P with in the cupfS to enablethe rollers b to bereleased frojm jthe rotation ring f" 1 The di ergingsnrf 'c s fand' 9form apices h at thepointfof "diiterg'ence and these apices- Am -y bespacedwith respect to each other 7 a distance equalling substantiallythe Width of the earn between the I straightfsides Q,

7 By thuspermittin'g'the lugs alto contact with th t ip i tfsa d ugs na'assi t fi a eriallyf ma nt i ifig ifl b L i p 'partsbecome worn duetousage;

he: rollers Z) greater depth than the diameters ot the frollers b andonly of slightlyjg'rea'ter' width. than the rollers so that theroll'erswilllat "time's lie in "planes substantially parallel to p theaxisof rotation, In this wayi'the 'rollers il be heldiagai swl i g w hi'p to the rotation ring E which they 'areadapted toengag'e' and willthere'fore 'atall times remain in the jcor'rect positionfso thatazinaximum area of contaetmay beina'intained between "thesefelements,and also ftoxassure 1 againstfthe "possibility ofonl'y one roller bevingclampedibetween'the andthei'otation During the operation 'of the detice,as the piston starts rearwardly from the-position 'illustratedinliiguife1i a'slight rotative inoifev ment i's imparte'd to the rifle bar Lat'the instant of reversal of the pistonand thus also tothe cam P. LThis is due itotheinterl ocki'ng f; spiral flutes'of the rifle bar andthel'rifle nut O, since, as'will be readily understood, the "pistontends to move inaf straigh-t line. As

aresult of such 'rotativefr'noizementof iithe rifle barthe'frollers.b'will be'pressedin a radial direction'firmly against the wall oftherotation ring Ethus preventing any further frotative movement oftheriflebar during this stroke of the piston. By holdingtheirifie bar againstrotatiojnQthe piston :B"wi1l'de'scribe a partialrevolutionon'therifiebar and,"be-

lugs

will be transmitted through the connecting elements to'the drillst'eelto change'theposition of the .drillisteel; in the'drill; hole forthe succeeding forward stroke of the piston.

of travel and at the instant?- of its. reversal the piston toenable'the-cam'Ptofeleasethe After the piston reaches its rearwardlimit I Irollers ;b @hiswilljenablethe rifle bar L to o rotate relatively to thepiston B and thus avoidf-anysfrietion;between the stationary and movableelements of the rotationniechaofthepiston; I

* a :In a rock drill twinge cylinder and a piston; rotation mechanismfor the piston ;co npris ing a rotation ring, a fie'barextend- *ingthrough the engine-the" v --te1-1eck slidabl-y with "the 'pismnac'urotata- .ble in the ring and havifng'longitudinal slots J v'itsiperiphejry frollersifnll'the' slots; a eain on therifiebar tores'sthe r 'lersagainst the reingand hol herifiebar' against rotal therifle bar, lugs integralwith theoove'r {and and seating surfaces tnthe-lugs bearing thus teasing 'parti'alrota tion oft'l're .pi's--'"having? an aperture to *g'uideone end of? *nism' 'whichm'lghtotherwiseh nderthe {speed lii 'de'rjto in against'the'inner surfaceofthe cup to prevent fiexion of the lugs.

pisto nf rotation mechanismf mock dnu having asunder in Tthe' pistontending throughthering into theioylii fder "to interloli 'sli d'ablywith the rotatable in thering aha-1m g l'on giuidinal f'slots in its"periphery, rollers the slots, a

1 :oarn onthe rifle barto pressthe rolle'rs against' "the rotation ringfor holding the rifi'e' bar against -iot'ation, thu c'ausingpartial"ffota- I tion of the piston relatively'to the "rifle 'b'ar,

fahei er-interlocked "izviththe o'u'p forming "bearing for one end ofthe rifle bar, lugs inte'gral' with the cover extendin into the foil-pon, oppositezsid'es oif'thecam; div rgin i surfaces ontheinnerside ofthe 'lu gs t'o' permit limited" "rel'ati've i rotatjive movement'-between "the cam-madam cup, and apicesiorined by saidsurfaces"abutting thesides' of the carnto prevent "relatlve transversemovement be-,

' tween (ialn and the "In testimony whereof]:

*speci'fieation.

hate signed this

